VOID
STREAMAPI
AdapterCancelPacket(
PHW_STREAM_REQUEST_BLOCK pSrb
)
{
PHW_DEVICE_EXTENSION pHwDevExt = (PHW_DEVICE_EXTENSION)pSrb->HwDeviceExtension;
PSTREAMEX pStrmEx;
int StreamNumber;
BOOL Found = FALSE;
//
// Run through all the streams the driver has available
//
for (StreamNumber = 0; !Found && (StreamNumber < DRIVER_STREAM_COUNT); StreamNumber++) {
//
// Check to see if the stream is in use
//
if (pStrmEx = (PSTREAMEX) pHwDevExt->pStrmEx[StreamNumber]) {
Found = VideoQueueCancelOneSRB (
pStrmEx,
pSrb
);
} // if the stream is open
} // for all streams
DbgLogInfo(("TestCap: Cancelling SRB %8x Succeeded=%d\n", pSrb, Found));
}
VOID
STREAMAPI
VideoReceiveDataPacket(
IN PHW_STREAM_REQUEST_BLOCK pSrb
)
{
PHW_DEVICE_EXTENSION pHwDevExt = ((PHW_DEVICE_EXTENSION)pSrb->HwDeviceExtension);
PSTREAMEX pStrmEx = (PSTREAMEX)pSrb->StreamObject->HwStreamExtension;
int StreamNumber = pSrb->StreamObject->StreamNumber;
//
// make sure we have a device extension and are at passive level
//
DEBUG_ASSERT(KeGetCurrentIrql() == PASSIVE_LEVEL);
DEBUG_ASSERT(pHwDevExt!=NULL);
DbgLogTrace(("TestCap: Receiving Stream Data SRB %p, %x\n", pSrb, pSrb->Command));
//
// Default to success
//
pSrb->Status = STATUS_SUCCESS;
//
// determine the type of packet.
//
switch (pSrb->Command){
case SRB_READ_DATA:
// Rule:
// Only accept read requests when in either the Pause or Run
// States. If Stopped, immediately return the SRB.
if (pStrmEx->KSState == KSSTATE_STOP) {
CompleteStreamSRB (pSrb);
break;
}
//
// Put this read request on the pending queue
//
VideoQueueAddSRB (pSrb);
// Since another thread COULD HAVE MODIFIED THE STREAM STATE
// in the midst of adding it to the queue, check the stream
// state again, and cancel the SRB if necessary. Note that
// this race condition was NOT handled in the original DDK
// release of testcap!
if (pStrmEx->KSState == KSSTATE_STOP) {
VideoQueueCancelOneSRB (
pStrmEx,
pSrb);
}
break;
default:
//
// invalid / unsupported command. Fail it as such
//
TRAP;
pSrb->Status = STATUS_NOT_IMPLEMENTED;
CompleteStreamSRB (pSrb);
} // switch (pSrb->Command)
}
